query language with direction errors

Problem/Motivation

When querying languages with the 'direction' option results with an error message.

{
  "errors": [
    {
      "message": "Internal server error",
      "extensions": {
        "category": "internal"
      },
      "locations": [
        {
          "line": 8,
          "column": 9
        }
      ],
      "path": [
        "entityQuery",
        "items",
        0,
        "direction"
      ]
    },

Steps to reproduce

1. Enable entity type `configurable_language (Language)`
2. Go to explorer and query languages with direction.

query MyQuery {
  entityQuery(entityType: CONFIGURABLE_LANGUAGE) {
    total
    items {
      ... on ConfigurableLanguage {
        id
        name
        direction
      }
    }
  }
}

Proposed resolution

Per https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Language%... getDirection() returns a string.

Change direction: Int! to direction: String! in /graphql/core/LanguageInterface.graphqls.

This will give expected result:

{
  "data": {
    "entityQuery": {
      "total": 31,
      "items": [
        {
          "id": "ar",
          "name": "Arabic",
          "direction": "ltr"
        },
        {
          "id": "cs",
          "name": "Czech",
          "direction": "ltr"
        },
        {
          "id": "da",
          "name": "Danish",
          "direction": "ltr"
        },